IEnumerable <ProductionModel> Factor(EbnfFactor factor, ProductionModel currentProduction)
{
switch (factor.NodeType)
{
case EbnfNodeType.EbnfFactorGrouping:
var grouping = factor as EbnfFactorGrouping;
foreach (var production in Grouping(grouping, currentProduction))
{
yield return(production);
}
break;
case EbnfNodeType.EbnfFactorOptional:
var optional = factor as EbnfFactorOptional;
foreach (var production in Optional(optional, currentProduction))
{
yield return(production);
}
break;
case EbnfNodeType.EbnfFactorRepetition:
var repetition = factor as EbnfFactorRepetition;
foreach (var production in Repetition(repetition, currentProduction))
{
yield return(production);
}
break;
case EbnfNodeType.EbnfFactorIdentifier:
var identifier = factor as EbnfFactorIdentifier;
var nonTerminal = GetNonTerminalFromQualifiedIdentifier(identifier.QualifiedIdentifier);
currentProduction.AddWithAnd(new NonTerminalModel(nonTerminal));
break;
case EbnfNodeType.EbnfFactorLiteral:
var literal = factor as EbnfFactorLiteral;
var stringLiteralRule = new StringLiteralLexerRule(literal.Value);
currentProduction.AddWithAnd(new LexerRuleModel(stringLiteralRule));
break;
case EbnfNodeType.EbnfFactorRegex:
var regex = factor as EbnfFactorRegex;
var nfa = _thompsonConstructionAlgorithm.Transform(regex.Regex);
var dfa = _subsetConstructionAlgorithm.Transform(nfa);
var dfaLexerRule = new DfaLexerRule(dfa, regex.Regex.ToString());
currentProduction.AddWithAnd(new LexerRuleModel(dfaLexerRule));
break;
}
}
